. The science of railways . two seats of un-equal areas, and has a stem extending back andconnecting with the piston P of an air intercepting valve moved, or opened, as inFig. 153, connects the receiver E with the low-pressure steam-chest port L, while if closed, as inFig. 152, it cuts off this communication and opensthe receiver R to the cavity U. The reducing valve is a long annular valve sur-rounding the intercepting valve stem and closesby moving to the left. When open, it admits livesteam from chamber S to the low-pressure steamchest cavity L; when closed, it cuts off this co
. The science of railways . two seats of un-equal areas, and has a stem extending back andconnecting with the piston P of an air intercepting valve moved, or opened, as inFig. 153, connects the receiver E with the low-pressure steam-chest port L, while if closed, as inFig. 152, it cuts off this communication and opensthe receiver R to the cavity U. The reducing valve is a long annular valve sur-rounding the intercepting valve stem and closesby moving to the left. When open, it admits livesteam from chamber S to the low-pressure steamchest cavity L; when closed, it cuts off this com-munication. The separate exhaust or emergency valve ^is 248 ENGINEERS AND FIREMENS MANUAL. an ordinary bevel-seated wing-valve with its right-hand end in the form of a piston. Steam pressurefrom a three-way cock in the cab, if admittedagainst this piston, forces the separate exhaustvalve open, thereby connecting the cavity U withthe main exhaust cavity C; without pressure onthis piston, the spring F again seats the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
